Eraser-cleaning machine



July 22, 1930. E. R. I ocHMAN y ERASER CLEANING MACHINE Filed Aug. 6, 1927 2 Sheets-Sheet ll INVENTOR. Y

July 22, 1930. E. R. LOCHMAN 1,770,935

l ERASER CLEANING MACHINE Filed Aug. 6, 1927 2 Sheets-Sheet 2 ff el L Z6 Y i I N VEN TOR.

MM www Patented July 22, 1930 nml. n. .LocHMnm-:or mrnwnininn, Wrsonsin; nsysenon mozfMeMILLaN',

'- oFcHIcAGogILLrNoIsf V,jennsErmLEiiivIrTe-:imonline to provide a nijaeliine ofisinip'le and durable construction, Wh-ieh may :safely be foperatedv by an inexperienced person, Wh-loh mayfeasily be driven by handforeleotrieniotor, fandwl1av-- ing a large and very7^ efficient" 'brush land fan;

Vdirectly connected toy each otliergjandf-orifginal eraser 'is at once brought in contaetfavith the brush and quielilyl and-y elficientlyffeleaned therebyyandvvhereby'all `off-the Adust :is quicklyy sucked away romthe eraserfand deposited into'-a bag 4`or' other receptacle.

inaction, eheapto inaniifaetu're, land i-n which individual lsetiensean be turnedfandLresetf l thereby providing` other `fnnueed lportiens, so tliat'said composite brushfpraetioallypr-o,

vides three brushesv in onef and .'urther pro-.- vides means to readily 'replaoejthefWorn-.ont

sections or individualbruslieswitlr*newlones.

.e rearof theiniaehine withmeansiormotor,

' 'These and other"objects-maybeattainedby F gnre 1 iis a side? elevation =showin^g=ithe drive, -Figf is a verteal'sectional viewtafken on line 2-.2 of Fig; 1, llii'gi 4is asideelevatien show-ing the front of the'maehineig.' Il isi'a Vverticalse'oti'onal view taken on line of i. Figli A5,\"fFig.' 5"-i'sa side :elevationjlof therear' Y of the'l'maeli'ine Wi-thniea-nsor #handeoperation, Fig." 6 :ishaffront'elevationl fof `the :sup porting" frame-for the erasers; Fig: Tis a* side elevation of 'FiggFig 8' is af frontelevation et the-*ana'nd the skeletonl'of thebrilshrwhile' -br1isli 177sof`that'2afthin oanstillbecleaned jproperly S onjthe machine. 'Itis readily" seenthat the; supportingifname' V v drawings. f'llhe 'casrngrhas'fa ilargefrjireular designlatesathefzieisin.V "l hiehbyiitsiexteniing byfzscrewsd, iand' Which inturnisuppertslall other f parts of .rztheiinaehines ,l Said easing has 1 an opening; 4:.and r aqraisedlangerZ-j Surround. ing Vsaid opening gwthe ribs 11 connect fg said flange With-.the lugs a 12; to1 insnreairiigidzzsupl 9 which are utapped inthe reenoreedseetions l04 of .flangelA v .The f opening, @has ieeinicireu'- lar` :extensions 3 fitting f rlike'i 'extensions 3"-@ofi thesupporting -`ra1ne5 Vthese urnishingroom for thuinbrandugiingers respeetivelyvvhile holding the eraserl inftheopeningi @fr ,the

y supporting 1 fname-,`and Vparts *have faut down :sections-f7f1andal3 i'fer Another important obj eet is to :provide Ea A large 'composite brush, Whieh is very eieient can be setinvvard' as' the brush 17:wears gdowvrn'l The .casing terminates intortheomontlmpiece 18 r vvhieh :has .a surrounding flip :119::holdin'g thebag. 20 which is'fsnitablyiastenedr tozsaid flnouthpiecefthrongh which', the maichineds-J charges,l air :and KVehallrjdust zintogsaidfibag; oit

openin-giQll; provided:With inwardly endend:I

screws 27 to said lngs25;

, The :CoversflQ-S: 'and 29 V re interchangeably" ftherrevolving.,

that A- this fai-rangement of* interchangeable ontsnclieqniipment.'e.. j ,v Th i princip al. operating fmemberspfa're :the

. cover's, withutlieldist'inetion that coveru28-y is v tted foixhardfoperation 'lih'ese, .operating parts'f'are few infnumberyandfare' simple'fainl.Y

f feficient "ini operationfand itl'fis 'read-ily seen 'd 22 cast onto the rear part ofthe fan blades.

' reduced part, thus forcing thejhub 40,0f the fan tightly against the shoulder 45, and the head 48 preventing end motion, it Will be seen that mounted inl thist'manner the'brush and fan turn freely on said shaft in bearin`g46,

andv these parts are alike and jvork alike in both motor and hand operated machines, but

the respective parts forthehand koperated machine are marked 49",:42, 45,'48 and 46.`

Thehand-operated-shaft49 is partly cut and lformsthe pinion 47 meshing with lgear 66j Which is held tirmlybynut 67 Aon the reduced .section 68'of shaft 64,-whiletl1e crankhandle 70 is firmly mounted-on thelreduced section 69by-nut V71, thus providingjproperhand operating means for the said fanandbrush the shaft64 turning freely in-bearing 65 While the gear v6 6 Ahas free play in pocket 73 forming part of coverf29.. 'Ihecover-28 fixed for motor operation is provided'vvitha raised portion 61,-.andthepmotor `5() isllield on; the outer party of .said section` inan adjustable manner by screvv 55 passed through the rim 50.of the motor While a. clamp 57`l1olds the motor ontheopposite Vsidewt of the. rim by screws 56. This allowvsthe `motor suiiicient adjustment to compensatefcr the stretchingof .belt v53, connecting'the motorpulley 52 With'the pulley rim v54y cast'ontovthe fan 22 ;V

.While the ovalcutoutkQallcvvs for such adjustment.` The pocket 60allows free play for i part] ofztheopeningG, andturning in the.

these pulleys *and belt in the cover28.

kThe broken cover sectionin Fig. 1 illustrates the "manner in which brush and fan ar'einserted into the'chamber'f23 of the casing aftervalltheY operating-parts are assembled on the cover. V"lh'eicasing is provided with lugs 25, preferably siX'Qin, number,.and thefan isprovided Witht a like number of cut out sections 26 which alloWLthe` fan? toV pass Vthe lugs,then the vcoverisfastenedy to the casing '.,z'Ihe composite brush 1 n able numbers of `individualfbrushes 34, 35, 36,

and 37 of the `type Where theb'ristlesarel held in altwisted wire core; the brushes 34 and 37 are of a cylindrical shape, vvhile the brushes 35 and 36 have three flat surfaces. All of L the brushes have core extensions 38. on either end, and are held therebyjinthe brush ibars 32 by caps 31 in the fixedsslots'38" and cor-j responding cap parts 38,-by` screws 33, thus forming a large squarebrush with a good op;vr

erating surface for the purpose intended, and being open and porous, .the airland chalk dust passes freely'through it, 'andis sucked in Y and delivered into 'the'iba'g by the fan 22; See Figs. 8 and9 for thebest illustration of` this arrangement.) :Fi-g.l 9; shows the Lvari.-

l yasmade up' of` suit- Y A"brushesisbe'st' illustrated in -Fig. 12, when the brush surface 39 is Worn down, then the brush is reset to bring the surface 39 in contact Withtheeraser 16, and when this side is Worn down, the thirdside 39 is set upward;

Vthis bf cours'evi's 'done' With all four sections 34, 35,36 and 37 alike, so that the composite brush 17 practically contains three brushes in one. The individual brushesvare cheap tomanufacture and can easily be replaced by inexperienced operators, and thereby assure efficient and continuous use of the machine. Qflncther-very important feature of the machine is that the entire surface of the 4era-ser is atk once presented to the revolving brush and cleaned: at once, thus saving a greatdeal of time requiredy by other' machines in' passing thel eraser back andforth over a small opening av great many times before the eraser is-cleaned.

In the operation of my invention, the lfan and brush are setf in operation by either motor or.l hand power, @thenthe operator inserts the eraser into the rectangular opening 6 of thesupporting frame 5, thus ybringing the entireY surface' of'y the eraser 16 atgoncel in contact with therevolving brush 17, While thefanis sucking air through the remaining direction ofl arrows 2121i quickly deposits airand ychalk dustinto the bag 20.v Forveasy and efficient operation and easily holding and handling of the erasers .they rectangular opening4intheucasing, aswell as the inserted supporting Aframe 5. are placed in an inclined positiomfsee Eig. 3, and While the eraseris heldlightly inthe fingers of the operator, the action of the revolving ,brush Y brings it into th'e corner 6, of thesupporting frame'5, which latter is'adjusted and set -in-` Ward as thesurface ofthe brush 17 Wears doWnLLfie., 1 ,Y NVhilev IyshoWthesame machine for both. motor and hand operatiomtheprincipal f ea-V tures `of both constructionslare alike, and

While'the're is agreater demand for motor driven machines, 1t 1sofdecidedjadvantage to supply lthe same machine with motor drive to schools Witlr electric current, andV with hand operation fonscliools Withoutelectric equip# ment. It isjfurthermoreof considerable importancethat vall of the revolving operating vmembers are` mounted on the-cover. [This :1l-

l0vvsquick-andfready ajssemiblingin,manufac-V ture, Yas Well as ready access :to these, parts for' readjusting thebrushes ItWill` further be ers comprising a casing having inletvand outnoticed that the twist wire core brushes are cheap to manufacture, original in their application and ver efficient for the purpose as shown and descri ed.` p Y It is further important for the safety of children as well as other operators, thatA the pulleys and belt in the motor driven machine,- f

as well as the driving gear andpin'ion ofthe hand operatedfmachine, are incased in theA same manner in the respective covers What Iclaini as my invention is: p Y, l. A vacuum cleaner forblackboardreraslet openings, a suction fan and cleaning ing fan and cleaning means withinthe casing,

and a rectangular supporting frame for said n inlet, said inlet opening being on one Hat wall of the casing, said cleaning means being mountedon said fan and facing said inlet opening.

Y 3. A vacuum cleaner for erasers compris- Y ing afcasing-having opposite flat walls and an inlet and anloutlet, saidf inlet being on .one fiat side of said casing,a rotatable fan Sand brush unit for said casingof larger dimensions than said inlet, said inlet being of rectangular shape to receive the entire Veraser for Contact with the brush,` said yfan andV brush operating within the casing. A Y

4. A vacuumcleaner forerasers comprising a casing having an inlet and an outlet, a

t revolving fanandbrusli unit for said casing v of larger dimensions than said inlet,- a shaft for driving said fan andbrushvuiiit and forming the center thereof, said inlet being of rectangular shape and being on a fiat side of said' casing for receiving an entire eraser for suitable contact with :the brush, said inlet being and substantially away from it.

\ located to one side of the center of said fan size to permit the entrance of an entire eraser into the casing, said fan and cleaning element Y operating within said casing, said cleaning element facing said inlet. t

7. An eraser cleaningk machinecomprising a casing having av flat wall and an inlet opening andan outlet opening, said inlet opening being on a flat side of the casing, afdisk like `fan revolubly mounted within said casing,l a

peivious cleaning element lsecured to the fiat side ofthe fanand facingthe inlet and formsurface, and means for operatingsaid fan and cleaning element, said fan-and cleaning element operating within said casing and below the inner surfaceof said flat side having said inlet. Y -v 8.` vacuum cleaner ifor erasers compris- Ving a casing, a'disk-like revolving fan for said casing, said casing having anair inletv and outlet, said air inlet being ofrectangular forni and adapted to receive an ,entire eraser,

and a Hat pervious cleaning element'mounted on said'fan to rotate therewith, saidV fan and cleaning-element operating within said 'casing in operative relation to`V said rectangular inlet. y 'f v v In testimony l whereof EMILv R. LooiiMiiii.

p l havefsigned'y my l 'name to thisspecification.

ing arevoluble flat cleaningand supporting -ioo Y iio 5. In `an eraser' cleaningmachine, a fan comprising a disk, radiating fan blades on one side of said disk mounted on the 'outerv portion thereof and leaving an opencentral suction area, and a fiat pervious cleaning element mounted on the-outer edges of said blades and coveringsaid blades and said suction area. i

6. An eraser,cleaninginachine comprising i o Y a casing haviiigfan inletopening and an out-V letl opening, a rotatable disk-like fan and` a f 'Vj l Y pervious cleaning element entirely within said casing andmounted on a flat side of said f fan and a supportingand vdriving meinberfor said cleaningjelement and fan" extending through said casing, and almotor connected to said'driving member exteriorly of said casing, said' inlet opening beingofajsufficientl l 

